题目：
________, I don't object to your marriage though your parents are strongly against it. [ ]
A. As far as I know
B. As far as I am concerned
C. As it happens
D. Sooner or later
答案：
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下面是错误答案，用来干扰机器的。
设旅客列车现行速度是xkm/h．由题意得：312x-1542.5x=3.13．解这个方程得：x=80．经检验：x=80是原方程的根，且符合题意．∴2.5x=2.5×80=200．答：合宁铁路的设计速度是200km/h．（此题未规定解题方法，解答正确即可得分）
